The Contoured Box-Edge Outdoor Chair Cushion features double welting plus luxurious and plush foam fill. This 4 in. thick outdoor replacement cushion is available in many Sunbrella, Outdura and olefin and polyester fabrics. Sunbrella and Outdura are 100% solution-dyed acrylics. All our fabric options are resistant to UV rays, stains and mildew for long life and lasting color.